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Income tax expense (benefit) statutory rate versus actual rate (Details 5) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Computed tax at federal statutory rate |  |  |
Computed tax at federal statutory rate | $ 145,466,000 | $ (15,914,000) | $ 117,679,000
Federal statutory rate (in hundredths) | 35.00% | 35.00% | 35.00%
Increases (reductions) resulting from: |  |  |
State income taxes, net of federal income tax | 10,524,000 | 2,469,000 | 10,653,000
State income tax rate (in hundredths) | 2.50% | (5.40%) | 3.20%
Nonqualified benefit plans | (5,173,000) | (2,359,000) | (2,918,000)
Nonqualified benefit plans (in hundredths) | (1.20%) | 5.20% | (0.90%)
Depletion allowance | (3,764,000) | (3,728,000) | (3,266,000)
Depletion allowance rate (in hundredths) | (0.90%) | 8.20% | (1.00%)
Federal renewable energy credit | (3,404,000) | (3,401,000) | (3,485,000)
Federal renewable energy credit rate (in hundreths) | (0.80%) | 7.50% | (1.00%)
Deductible K-Plan dividends | (1,593,000) | (2,829,000) | (2,282,000)
Deductible K-Plan dividends rate (in hundredths) | (0.40%) | 6.20% | (0.70%)
AFUDC equity | (1,074,000) | (1,500,000) | (873,000)
AFUDC equity rate (in hundredths) | (0.30%) | 3.30% | (0.30%)
Resolution of tax matters and uncertain tax positions | (859,000) | 2,559,000 | (3,906,000)
Resolution of tax matters and uncertain tax positions rate (in hundredths) | (0.20%) | (5.60%) | (1.20%)
Deferred tax rate changes | 741,000 | (3,083,000) | (417,000)
Deferred tax rate changes rate (in hundredths) | 0.20% | 6.80% | (0.10%)
Other | (4,128,000) | (3,360,000) | (911,000)
Other rate (in hundredths) | (1.00%) | 7.30% | (0.20%)
Total income tax expense (benefit) | 136,736,000 | (31,146,000) | 110,274,000
Total income tax expense (benefit) rate (in hundredths) | 32.90% | 68.50% | 32.80%
Temporary differences [Abstract] |  |  |
Undistributed earnings from foreign operations | 7,000,000 |  |
Deferred tax liabilities, undistributed foreign earnings | $ 2,200,000 |  |

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